Abstract
Effect of ultraviolet light irradiation on the photoluminescence of carbon dots (CDs) is investigated. After the ultraviolet light irradiation, CDs exhibit red shifted and enhanced green emission, and significantly enhanced emission in the wavelength region from green-yellow to red. Carbonyl groups increase remarkably originated from photochemical oxidation, resulting in more defect energy trapping (DET) states, higher electron density, and stronger n(OH)→π*(CO) interactions. Consequently, a decrease in band gap and more contribution from the DET states related radiative recombination result in an enhancement of green emission and beyond, while ultraviolet emission is reduced and blue shifted due to the decrease of sp2 carbons.
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